2.6.- Oxygen uptake rate (OUR)
Determination of the oxygen uptake rate (OUR) was performed by applying the dynamic method (Yoon and Konstantinov, 1994; Zhou and Hu, 1994). This method is based on interrupting the air inflow to the bioreactor for few minutes. Then dissolved oxygen concentration decreases due to the respiratory activity of the cells and to the oxygen desorption from the liquid phase to bioreactor headspace. The specific methodology used in this work is detailed somewhere else (Fontova et al., 2018; Lecina et al., 2006; Martínez-Monge et al., 2018b; Martínez-Monge et al., 2019b).